On Fri, 9 Feb 2007, Radomir Zugic wrote:
> Hello List,
>
> I'm trying to reverse engineer a usb protocol. I'm interested in how
> usb devices work in general. Is the communication always passive or
> can devices actively request data or perform some sort of
> authentification with the driver? I see patterns in the protocol as
> well, is it possible that some devices require a "keep alive" signal?
> I've also tried performing what seem to be requests in the snoopy
> logs, but got inconsistent replies. Is usb communication in general
> request/response or should i consider the device as a finite state
> automaton, where a particular sequence of commands puts the device
> into a certain state (possibly writing desired data to an endpoint)?
> At the moment i have a few hundred pages of logs and before I get lost
> in the details I thought I could ask for some advice. Does anyone have
> any experience in reverse engineering usb protocols and can give me
> some pointers? I could also put the logs online if someone's
> interested in taking a look. The device is a Logitech IO2 digital pen.
>
> Any help is much appreciated,
> Rade
If you really want to learn about the USB protocols, there's no substitute
for reading the official specification. Go to
http://www.usb.org/developers/docs/
Alan Stern
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